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Tooth Bending Strength of Spur and Helical Gears

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Gears

Part of the book series: Springer Series in Solid and Structural Mechanics ((SSSSM,volume 11))

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Abstract

In this chapter, a general survey is first done on the tooth bending strength of spur and helical gears, also focusing attention on fatigue tooth root breakage and safety factor to be used for their design. The theoretical bases of calculation of tooth bending strength are then discussed, with particular reference to the constant strength parabola introduced by Lewis and 30° tangent lines proposed and used subsequently. Stress state at the tooth root is then analyzed, considering the load application at the outer point of single pair gear tooth contact as well as the local stress concentrations , also due to combined local notch effects. Finally, the procedure for calculating the tooth bending strength of these types of gears in accordance with the ISO standards is described, highlighting when deemed necessary as the relationships used by the same ISO are founded on the theoretical bases previously discussed.

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  1. University of Rome “Tor Vergata”, Rome, Italy

    Vincenzo Vullo

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  1. Vincenzo Vullo
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Correspondence to Vincenzo Vullo .

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Vullo, V. (2020). Tooth Bending Strength of Spur and Helical Gears. In: Gears. Springer Series in Solid and Structural Mechanics, vol 11. Springer, Cham. https://doi.org/10.1007/978-3-030-38632-0_3

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  • DOI: https://doi.org/10.1007/978-3-030-38632-0_3

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